ASUS P5S800-VM help needed

I have a "small" problem overclocking my PC. MoBo is ASUS P5S800-VM, and in BIOS (ver. 1021) aren't any setting possibilities for it (or I can't find them). The only option is so called AI Overclocking, that should automatically set up wanted performancies (OC + 5%, +10%, +20% and +30%) but it simply doesn't functioning, either system crashes as soon as win is loaded or it happens nothing. I've tried almost all of the combinations, several tweaking progs without success as well, but it just doesn't overclock, not even these 5%. CPU is Celeron D Prescott, that actually should be quite overclockable (that makes me even more frustrating

It's not the VM, it's the S in the middle. SiS and VIA, even nvidia for Intel are notorious bad overclockers. On Asus boards there is Auto, Manual, and Ai booster. Maybe a BIOS update will give the usually options. I know some of the mATX mobo have them. Do you have Ai booster in windows?

KingCody: Yes, I've heard that VMs are HARD but POSSIBLE to overclock (but hey, isn't it THE challenge all OClockers are looking for?)

Mirob: Original BIOS was ver. 1015, without any direct OC option or possibility (FSB), but of course there are always some improvements that could be done. Anyhow, have updated bios to ver 1021 and wow, there is subsection "JumperFreeConfiguration" with submenu "AI Overclocking" (5, 10, 20 and 30% up). Now, as I set it even to 5% up, system either will not boot or crashes just after win is loaded (AI Booster cannot be installed on my mobo) The tricky part: I have brought it to 2,95 GHz (originally 2,66, AI Overclocking +10%), but none of the bench tools (Sandra, CPU-Z) reported it as oc-ed, despite bios and system properties reported it so. (It's getting even more confusing, ha?)

Now, does anyone knows some OC tool that closely supports my mobo (if it cannot be done through bios) or are they some spec bios settings that should be enabled/disabled to get oc. Have tried ClockGen, SoftFSB but none supports "this wonderfull mobo"

Yes, I've heard that VMs are HARD but POSSIBLE to overclock (but hey, isn't it THE challenge all OClockers are looking for?)

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yes it is possible to overclock it slightly, but not a significant amount.

It loses it's stability at 10%, so 5% is probably the maximum overclock you can achieve with it (but you never know )

The main reason is the simple lack of a PCI/AGP bus lock. without a bus lock when you overclock the CPU, you overclock your PCI/AGP cards as well. PCI and AGP cards have a very low tolerance to to an overclocked bus.

that is also the reason why windows based overclocking utilities are pretty much useless unless (unless the PCI/AGP bus was locked in the BIOS first and your RAM can handle the extra speed)

The settings 4 PCI/AGP available are: "auto", 66/33 75/37,5 and 87,5/43,7. Now, even if I let it on 66-33, (multi by 8 should give 532 - the original fsb speed only) 3d graphics became very unstable. Is there any possibility to "downclock" PCI/AGP card via atitool or ati tray tool to make it stable - and if, how? These tools have some settings that exceed my knowledge